Joiix arthur mosiier



(No Model.)

J. A. MOSHER.

ELECTRIC ARG LAMP.

(g1/Wenko@ Patented Feb. 17,1891.

' UNITED STATES PATENT OFFICE.

JOHN ARlllUR MOSHER, OF ABILENE, KANSAS, ASSIGXOR T() THE MOSHER ARO LAMP COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 446,459, dated February 1'7, 1891. Application filed July 8, 1890. Serial No. 358,073. (No model.)

To @ZZ whom it may concer/L:

lle it known that l, JOHN An'rnt'r. )[osHEi-z, a citizen of the United States, residing at Abilene, in the county of Diekinso1i,State of Kansas, have invented certain new and useful Improvements in Arc Lamps, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates t certain new and useful improvements in arc lamps; and it has for its object, among others, to provide for the regulation of the downward and upward movement of the carbon-rod when the lamp is feeding.

It has for a further object to provide an improved brake device or grip for suddenly arresting the movement and holding' in position the carbonrod when desired.

Other objects and advantages of the invention will hereinafter appear, and the novel features thereof will be particularly pointed out in the appended claims.

The invention is clearly illustrated in the accompanying drawings which, with the letters of reference marked thereon, form a part of this speeilieation, and in which- Figure l is a side elevation illustrating` my improvement, with parts broken away and others in vertical section. Fig. is a detail in side elevation looking at right angles to Fig. l. Fig'. 3 is au enlarged vertical section of the magnet-core. Fig. l is a plan view of the grip device removed. Fig. 5 is a vertical section through the lower part of Fig.

Like letters of reference indicate like parts throughout the several views.

Referring now to the details of the drawings by letter, A designates a hollow metallic tube, closed at its upper end and at said up per end provided with an aperture a to re ceivc the hook or other means by which the lamp may be suspended. This tube extends through and is attached to the disk B, as shown iu Fig. l, being extended through the disk for the purpose of holding the solenoid spool laterally in position.

C is a carbon rod or holder, the upper end of which is .fitted with a piston-headb, preferably of metal, and beneath said head is a flexible cup b', preferably of leather. The object of this device is to check and regulate the downward er upward movement of the carbou-rod when the lamp is feeding. rl`he pistonhead being nearly air-tight, the carbon-rod can descend or ascend only as fast as the air in the space above the piston-head expands or contracts, as the case may be, and after the arc is formed sufficient air can pass the piston-head to restore the air above to its' normal condition.

D isametal disk,constructed as shown, aud carrying the binding-post D. lt is designed to slide freely on the tube A, and is for the purpose of providing inclosedY space above the disk B sufficient to contain a rheostat when the lamp is to be used on a circuit ef constant potential.

E is a solenoid or main-circuit coil of coarse wire, having adifferential winding of fine wire for a derived circuit on the outside, as shown 7o in Fig. l, and is suspended from the disk B by screws or other analogous means c.

F is the magnet-core, made by winding a sheet of annealed charcoal iron, of suitable size, onto two brass bushings f, and is secured by a winding of fine brass wiref at either end, as shown. The bushingsfslide closely but freely on the carbon-rod, which thus provides a guide to the core and prevents the same from touching the solenoid and thus 8o preventingfriction on the same. By this construction and arrangement the magnet-core can operate freely at any angle that the lamps may be caused to assume by reason of wind or from any other cause.

The supporting-frame, consisting' of a disk B and B', is held together by means of side rods l?, the lower ends of which are suitably held in lugs ou the inverted yoltepiece B3, in which the lower carboirholder is supported, 9o and these rods are rc-enforced by tubes llt, which inclose said rods from the top of the frame to a point just above the `line of are, say about two inches, thus insuring maximum strength with minimum of shadow. Said tubes are cut at proper length to divide the distance between the disk l and B', as shown, suitable insulating collars or pieces d being inserted at the proper peint, as shown, and the whole clamped together by means of suitroo able nuts e, as shown in Fig. l.

G is the usual dash-pot connected to the Axo end of the walking-beam G, and supported upon the disk B', for the purpose of prevent ing pumping, as used in the art. Gr2 is a spring connecting the opposite ends of the walking-beam with they dish B for the purpose of helping to sustain the Weight of the suspended parts. The walking-beam is swung on the magnet-core in any suitable manner. The grip device or grip is constructed as follows: H is a metallic frame suspended from the magnet-core by means of the links h. Il is a metal block, through which the grip-pin I-l2 passes horizontally, and through which the carbon-rod `passes vertically, as shown in Fig. 4L. vh' is a trip rod or lever at cached to the frame H, as shown in Figs. 2 and 4, and operates to release pressure of the grip-pin on the carbon-rod when desired.

The operation of the lamp is as follows: Then no current is on, the carbons are together and the magnet-core is lowered to its fullest extent. Then the current is turned in, the said core rises, and bylitting with it the grip-frame II and its connected parts causes a partial revolution of the grip-pin H2, wh-ich 'binding the carbon-rod the whole rises to the point requisite to form the proper are. As the are lengthens by consumption of carbon the derived. circuit-coil increases in power and,owing to its differential winding,weakens the main-circuit coil, thus allowing the magnet-core- F to descend sufficiently to put in operation the trip rod or lever 7L', which, strik- 1n g on the disk B', operates to revolve the grippin sufficiently to release the carbon-rod,

allowing it to descend as required to maintain the main binding-posts and movable on the tube, substantially as described. 2. The combination, with the tube and the carbon rod or holder provided with a pistonhead movable in said tube, of the-disk ex' Vtending around the tube and the solenoid depen ding from and secured to said disk, and the magnet-core movable on and guided by the carbon rod or holder, and the metal disk earrying the main binding-posts and movable on the tube, substantially as described.

3. The combination, with thegnovable core, the stationary disk B', and the movable metal disk carrying the main binding-posts, of the frame swung from the core, the transverse grip-pin carried by said frame, the carbonholder, and the trip-lever vattached to said frame, substantially as described.

4. The combination, with the carbon-rod, of the core formed of laminated iron and bushings movable on the carbon-rod, substan-t J '()HN ARTHUR MOSHER.l Witnesses:

W. A. BURBANK,

L. H. WoRTHrNeSroN, W. P. GULICK. 

